Presonus Quantum ES4

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Presonus Quantum ES4

Presonus

Quantum ES4

5 Expert Rating

Product Info

Article Number: 588791
Brand: Presonus
Model: Quantum ES4
Price: $306.90

* Prices may vary. Check retailer for current pricing and availability.

The Quantum ES4 is a seriously solid interface for singer-songwriters, smaller home studios, and anyone needing reliable, clean preamps. The front panel instrument inputs are a killer feature, and the Universal Control app is a huge time-saver. It’s a really well-rounded package that gets you recording quickly and professionally.

Product Description

  • Presonus Quantum ES4
  • 4 x 4 USB 2.0 Audio Interface with USB-C Connection
  • Conversion with up to 24-bit/192 kHz
  • Four combo inputs mic/line: XLR/jack
  • Two instrument inputs on the front
  • 48 V phantom power
  • Four MAX-HD preamps with 75 dB gain each
  • Auto gain function
  • Control functions such as pre-amplification and phantom power directly from Studio One or the Universal Control app
  • LED level indicator for monitoring the input and output levels
  • Loopback function
  • Two balanced TRS main outputs and two TRS jack line outputs
  • Built-in speaker switching for the use of up to two pairs of speakers
  • Two stereo headphone outputs
  • MIDI In and Out
  • Latency-free monitoring
  • Bus powered
  • System requirements Interface: Windows 10 or later
  • Mac OSX 10.14 or later
  • Dimensions (W x D x H): 213 x 157 x 48 mm
  • Weight: 0.81 kg
  • Includes 1.5 m USB-C to USB-C cable and Presonus Studio One Pro (download)

*Note:* If the USB-C port to which the interface is connected does not provide sufficient power (5 V DC / 2.6 A), an additional USB-C/USB-C cable and a USB-C power adapter with the appropriate specifications are required (not included).

PROS
  • • Excellent MAX-HD preamps deliver clean gain with low noise.
  • • Front-panel instrument inputs are a real boon for tracking guitars/keys.
  • • Universal Control app offers comprehensive and intuitive device management.
  • • Built-in speaker switching simplifies monitoring with multiple studio setups.
CONS
  • • USB 2.0 connection feels dated compared to Thunderbolt options.
  • • Limited input count (4) might restrict more complex recording scenarios.
  • • Bus-powered operation can introduce noise if power source is unstable.

Product Video

Key Features

Inputs 4 XLR/Jack Combo, 2 Instrument
Outputs 2 TRS Main, 2 TRS Line, 2 Stereo Headphone
Max Sample Rate 192 kHz
Bit Depth 24-bit
Preamps MAX-HD (75 dB gain)
Weight 2.5 lbs

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Frequently Asked Questions

The MAX-HD preamps offer significantly lower noise and distortion, providing a cleaner, more transparent sound than the earlier StudioLive models, particularly at higher gain settings.
While USB 2.0 is a limitation, the ES4's efficient design generally performs well, but very CPU-intensive plugin chains might require optimization or a more powerful computer.
While basic drivers are available, Universal Control unlocks the full potential, allowing for detailed routing, gain staging, and speaker switching – it's highly recommended.

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